package cn.edu.scau.cmi.liujiaming.chapter09;

public class Example9_4 {
	   public static void main(String args[]) {
	      double sum=0,item=0;
	      boolean computable=true; 
	      for(String s:args) {
	         try{ item=Double.parseDouble(s);
	              sum=sum+item;
	         }
	         catch(NumberFormatException e) {
	              System.out.println("您键入了非数字字符:"+e);
	              computable=false;
	         }
	      }
	      if(computable)
	         System.out.println("sum="+sum); 
	  }
	}
